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Piston Rings

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Part Number
18-3903

Manufacturer
Sierra Marine

18-3903 Piston Ring Mercury 39-27841A12

PLEASE NOTE: The Sierra Part 18-3903 is THREE RINGS for ONE PISTON ONLY while the Mercury set is twelve rings. If you order the Sierra 18-3903 you will only get THREE RINGS as shown.
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Sierra Marine Piston Rings is equivalent to parts:

Sierra Marine is the market leader for aftermarket marine engine parts. Sierra products cover every major engine brand. Sierra offers a comprehensive product line and an unsurpassed customer satisfaction warranty covering parts and labor.